The S2 pro series is a very nice manifold and I would definately have it over the AEBS but if money is your concern then the AEBS is a good quality unit that you will get real gains out of for a very reasonable price. I would say to go with a chipped ECU and change over from obd2-obd1 for tuning, if you are going to do cams or something along thos lines. The VAFC is not bad but you can't change timing or redline points with it.